Buggy code:
private final String javaClassName ; private final ClassDefinitionBuilder classBuilder ; private final int typeFlags ; private final Type attrType ; private final boolean toplevel ; private final boolean late ; private final boolean lateWithInit ; private final boolean variable ; private long modifiers ; private boolean readable = true ; private final MethodDefinitionBuilder getterBuilder ; private JCExpression variableInit ; private HasErrorException variableInitThrow ; private boolean writable = true ; private final MethodDefinitionBuilder setterBuilder ; private AbstractTransformer owner ; private int annotationFlags = Annotations . MODEL_AND_USER ; private boolean valueConstructor ; private ListBuffer < JCAnnotation > classAnnotations ; private ListBuffer < JCAnnotation > modelAnnotations ; private ListBuffer < JCAnnotation > userAnnotations ; private ListBuffer < JCAnnotation > userAnnotationsSetter ; private ListBuffer < JCAnnotation > fieldAnnotations ; private boolean isHash ; private JCExpression setterClass ; private JCExpression getterClass ; private AttributeDefinitionBuilder ( AbstractTransformer owner , TypedDeclaration attrType , String javaClassName , ClassDefinitionBuilder classBuilder , String attrName , String fieldName , boolean toplevel , boolean indirect ) { } public static AttributeDefinitionBuilder wrapped ( AbstractTransformer owner , String javaClassName , ClassDefinitionBuilder classBuilder , String attrName , TypedDeclaration attrType , boolean toplevel ) { } public static AttributeDefinitionBuilder singleton ( AbstractTransformer owner , String javaClassName , ClassDefinitionBuilder classBuilder , String attrName , TypedDeclaration attrType , boolean toplevel ) { } public static AttributeDefinitionBuilder indirect ( AbstractTransformer owner , String javaClassName , String attrName , TypedDeclaration attrType , boolean toplevel ) { } public static AttributeDefinitionBuilder getter ( AbstractTransformer owner , String attrAndFieldName , TypedDeclaration attrType ) { } public static AttributeDefinitionBuilder setter ( AbstractTransformer owner , String attrAndFieldName , TypedDeclaration attrType ) { } public AttributeDefinitionBuilder modelAnnotations ( List < JCAnnotation > annotations ) { } public AttributeDefinitionBuilder classAnnotations ( List < JCAnnotation > annotations ) { } public AttributeDefinitionBuilder fieldAnnotations ( List < JCAnnotation > annotations ) { } public AttributeDefinitionBuilder userAnnotations ( List < JCAnnotation > annotations ) { } public AttributeDefinitionBuilder userAnnotationsSetter ( List < JCAnnotation > annotations ) { } public List < JCTree > build ( ) { } public void appendDefinitionsTo ( ListBuffer < JCTree > defs ) { } private boolean isDeferredInitError ( ) { } private List < Type > getSatisfies ( ) { } private void generateValueConstructor ( MethodDefinitionBuilder methodDefinitionBuilder ) { } private JCExpression attrType ( ) { } private JCExpression attrTypeRaw ( ) { } private long getGetSetModifiers ( ) { } private JCTree generateField ( ) { } private JCTree generateInitFlagField ( ) { } private JCTree generateInitExceptionField ( ) { } private JCTree generateFieldInit ( ) { long flags = ( modifiers ) & ( Flags . STATIC ) ; JCTree . JCExpression varInit = variableInit ; if ( hasInitFlag ( ) ) { varInit = variableInit ; } <START_BUG> JCTree . JCAssign init = owner . make ( ) . Assign ( owner . makeUnquotedIdent ( fieldName ) , varInit ) ; <END_BUG> List < JCStatement > stmts ; if ( isDeferredInitError ( ) ) { String exceptionName = "x" ; JCStatement saveException = owner . make ( ) . Exec ( owner . make ( ) . Assign ( owner . makeUnquotedIdent ( Naming . getToplevelAttributeSavedExceptionName ( ) ) , owner . makeUnquotedIdent ( exceptionName ) ) ) ; JCStatement nullValue = owner . make ( ) . Exec ( owner . make ( ) . Assign ( owner . makeUnquotedIdent ( fieldName ) , owner . makeDefaultExprForType ( this . attrType ) ) ) ; JCStatement initFlagFalse = owner . make ( ) . Exec ( owner . make ( ) . Assign ( owner . naming . makeUnquotedIdent ( Naming . getInitializationFieldName ( fieldName ) ) , owner . make ( ) . Literal ( false ) ) ) ; JCBlock handlerBlock = owner . make ( ) . Block ( 0 , List . < JCTree . JCStatement > of ( saveException , nullValue , initFlagFalse ) ) ; JCExpression throwableType = owner . makeJavaType ( owner . syms ( ) . throwableType . tsym ) ; JCVariableDecl exceptionParam = owner . make ( ) . VarDef ( owner . make ( ) . Modifiers ( 0 ) , owner . naming . makeUnquotedName ( exceptionName ) , throwableType , null ) ; JCCatch catchers = owner . make ( ) . Catch ( exceptionParam , handlerBlock ) ; JCTree . JCAssign nullException = owner . make ( ) . Assign ( owner . makeUnquotedIdent ( Naming . getToplevelAttributeSavedExceptionName ( ) ) , owner . makeNull ( ) ) ; JCTree . JCAssign initFlagTrue = owner . make ( ) . Assign ( owner . naming . makeUnquotedIdent ( Naming . getInitializationFieldName ( fieldName ) ) , owner . make ( ) . Literal ( true ) ) ; List < JCStatement > body = List . < JCTree . JCStatement > of ( owner . make ( ) . Exec ( init ) , owner . make ( ) . Exec ( nullException ) , owner . make ( ) . Exec ( initFlagTrue ) ) ; JCTree . JCTry try_ = owner . make ( ) . Try ( owner . make ( ) . Block ( 0 , body ) , List . < JCTree . JCCatch > of ( catchers ) , null ) ; stmts = List . < JCTree . JCStatement > of ( try_ ) ; } else { stmts = List . < JCTree . JCStatement > of ( owner . make ( ) . Exec ( init ) ) ; } return owner . make ( ) . Block ( flags , stmts ) ; } private JCBlock generateDefaultGetterBlock ( ) { } private boolean hasInitFlag ( ) { } public JCBlock generateDefaultSetterBlock ( ) { } private JCExpression makeInitFlagExpr ( boolean positiveIfTest ) { } private JCExpression fld ( ) { } public AttributeDefinitionBuilder modifiers ( long ... modifiers ) { } public AttributeDefinitionBuilder is ( long flag , boolean value ) { }

Fix:
JCTree . JCAssign init = owner . make ( ) . Assign ( owner . makeUnquotedIdent ( Naming . quoteFieldName ( fieldName ) ) , varInit ) ;